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arXiv 2410.04044cond-mat.mes-hallcond-mat.mtrl-sci
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拓扑磁旋缺陷模式

Topological magnonic dislocations modes

Universidad de Chile(智利大学);Universidad de La Frontera(弗雷罗纳塔大学)

Carlos Saji, Nicolas Vidal-Silva, Alvaro S. Nunez, Roberto E. Troncoso

AI总结:

研究揭示了二维铁磁体中由晶格位错引发的拓扑保护磁旋缺陷模式,其具有鲁棒的拓扑特性,并在磁性混乱中表现出显著的稳定性。

摘要:

在二维铁磁体中,研究了晶格位错存在下的自旋涨落。我们展示了存在拓扑保护的非传播模式,这些模式在位错处局域。这些间隙态,称为磁旋缺陷模式,由子格磁各向异性诱导的奇偶性对称性破缺所产生,具有$Z_2$拓扑不变量。我们发现完美晶体中存在的体拓扑性在晶格缺陷影响下具有鲁棒性,这通过实空间Bott指数进行监测。还揭示了当体拓扑性变为平凡时,磁旋缺陷模式的拓扑性仍然保持不变,并且对磁性混乱具有显著的抗性。我们的发现揭示了拓扑晶格缺陷与拓扑自旋激发谱之间引人入胜的关系。

英文摘要:

Spin fluctuations in two-dimensional (2D) ferromagnets in the presence of crystalline lattice dislocations are investigated. We show the existence of topologically protected non-propagative modes that localize at dislocations. These in-gap states, coined as {\it magnonic dislocation modes}, are characterized by the $Z_2$ topological invariant that derives from parity symmetry broken induced by sublattice magnetic anisotropy. We uncover that bulk topology existing in the perfect crystal is robust under the influence of lattice defects, which is monitored by the real-space Bott index. It is also revealed that the topology of {magnonic dislocation modes} remains unaffected when bulk topology becomes trivial and is remarkably resilient against magnetic disorder. Our findings point to the intriguing relationship between topological lattice defects and the spectrum of topological spin excitations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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